Steam-generator



(No Model.) 2 Sheets-Sheet 1.

J. J. ROHAN. STEAM GENERATOR.

Patented Sept. 24, 1895.

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(No Model.) 2 Shets-Shet 2.

J. J; ROHAN. STEAM GENERATOR.

No. 546,786. Patented Sept. 24, 1895.

UNITED STATES IPA-TENT O FI E.

JAMES .LROHAN, OF LOUIS, MISSOURI.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 546,786, dated September 24, 1895.

Application filed April 17, 1895. Serial No. 546,035- (No model.)

To all whom/ it may concern.

Be it known that'I, JAMEsJ. ROHAN, a citizen of the United States, residing at the city of St. Louis, in the State of Missouri, have invented a certain new and useful Steam- Generator, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings, forming part of this specification.

The object of my invention is the construction of a steam-generator which shall be com.- pact and efficient, and which is also particularly adapted to receive adowndraft-furnace.

One part of the invention, briefly and generally stated, consists in a steam-generator having a central drum and a curved hollow shell communicating with and surrounding said drum, the axis of said shell being horizontally arranged, preferably with radial water-ltlubes passing from the drum to the said she Another part of the invention, briefly and generally stated, consists in such a generator havingits straight lower side set in an inclined direction, so as to receive within it a furnace, preferably of the downdraft type.

The invention also consists in other features and combinations of parts set forth in the claims at the end of this specification.

In the drawings representing a steam-generator made in accordance with'my invention,

Figure 1 is a vertical sectional end view thereof.

on the plane of the line 1 1 of Fig. 2. Fig. 2 is a central and vertical sectional front view at right angles to the plane of Fig. 1 and on the line 2 2 of Fig. 1. Fig. 3 is a front elevation thereof, showing but a portion of the smoke-stack. Fig. 4 is an end elevation of the same and the setting therefor.

The same marks of reference indicate the same parts throughout the several views of the drawings.

5 is a curved hollow shell located between the two curved sheets 6 and'7, and has its axis substantially. horizontally arranged. This curvedhollow shell communicates with hollow ends 8, formed by outer heads 9 and innor heads 10. The ends of the curved hollow shell are'closed by. flanged plates l2 and 13, which are suitably riveted to the curved sheets 6 and 7. The peripheries of the outer heads 9 are alsosuitably riveted t0 the outer curved sheet 6, and the inner head 10 is suitably riveted to the inner curved sheet 7. The generator is preferably placed upon a diagonal or inclined setting 14-, as shown in Fig. 4.

Within the. center of the generator is a cylindrical drum 15, which communicates with the ends 8 of the shell 5. The drum 15 is riveted to the inner heads 10 and a disk cut out from the center of said heads, in order to afford communication between the drum 15 and the hollow ends 8 of the shell 5. From the cylindrical drum 15 to the shell 5 may extend radialwater-tubes 16, set along the length of the drum 15. In the outer heads 9 of the shell 5, opposite the drum 15, are located manholes 17, covered by suitable removable plates in the usual way, whereby access may be had to the drum 15 and the tubes 16 cleaned, and whereby also a person may reach the shell 5 and remove any scale therefrom and from the tube 16.. From below the drum 15 extend, preferably, two water-legs 18 to a mud-drum 19, which is suitably supported by legs 20 from the foundation orfloor. This mud-drum being below the ends or sides of the generator, its endsare extended beyond the heads 9 of the hollow shell 5, through the masonry 14, as shown in Figs. 2 and 4. The said muddrum is at one endthereof provided with a manhole 21, covered by a suitable removable plate in the ordina'ry way, and at the other end thereof may be provided with a hand-hole 22, covered by a removable plate, in the usual manner. .The mud-drum may sustain the weight of the central drum 15. Preferably at the highest point of the curved sheet 6 are two tubular standards 23, communicating with a steam-drum 24 above the generator proper. This steam-drum may also be provided with a manhole 25, covered by a removable plate, in the usual manner. So, too, the shell 5 may be provided near its top in one of the outer heads 9 with a manhole 26, covered by a removable plate, in the ordinary way. Extending from the shell 5, preferably through the plate 13, are, by preference,- two pipes 27, which pass to a drum 28, located within or without the furnace-front 11, as desired, from which drum 28 extend in an upwardly-inclined direction a series of water-tube grate bars 29 to the central drum 15, heretofore described. Below these water-tube grate-bars may be a grate 30 of the ordinary construction, that may be supported at one end by a bracket 31, extending from the boiler-front 11, and at the other end sustained by a ledge or projection 32, upon or attached to the muddruin 19.

In the front ll of the generator, above the water-tube grate-bars, are doors 33, preferably hinged at the top and swinging outwardly. These doors lead to the fuel-charging chamber. Below said doors and between the water-tube grate-bars and the ordinary grate may be other doors 3i, hinged at their sides or ends, whereby access may be had to the grate 30. Below these doors 3a are other doors 35, hinged at their outer sides to the front 11 of the generator and leading to the ash-pit beneath the grate 30. The series of radial water-tubes 16 next above the watertube grate-bars 20 are provided with archways or a fireproof covering 36 to preventthe draft of the fire from passing upward from the water-tube grates 29. The lower part of these radial water-tubes 16 are exposed to the fire upon the water-tube grate 20, and serve to keep comparatively cool the archways between said tubes and at the same time cause the water passing therethrough to be heated. The lower part of said radial watertubes also serve to keep the fuel upon the water-tube gratebars 29 from taking fire on top by keeping comparatively cool the fuelcharging chamber above the fire, and thus the fire burns from below only, as it properly should on a downdraft-grate. The action and construction of the downdraft-furnace herein described are similar to that of ordinary downdraft-furnaces. The down and up drafts uniting slightly in front of the waterlcgs 18, as shown by the arrows in Fig.1, pass thence around said water-legs over the top of the mud-drum 19 and against the under side of the central drum 15, and thence impinge against the radial water-tubes, as illustrated by the arrows in Fig. 1. Through the shell 5 of the generator and perforating the curved sheets 6 and 7 along the front thereof are fire-tubes 37, through which the products of combustion pass after traversing the firespace between the central drum 15 and the shell 5. The products of combustion enter a smoke-stack 38 at the front of the generator after going through fire-tubes 37.

It will be seen that the steam-generator which I have described is exceedingly compact, and that its construction is such as will secure great efficiency and capacity. The furnace shown is completely housed by the generator and the fire is within the very center of the generator, being enveloped on all sides by water-spaces. The water-legs 18, the

central drum 15, and the mud drum 19 are arranged where the hottest part of the fire can play upon them. So, too, the fire, in passing at right angles to the radial water-tubes 16, is applied to the best advantage. The front lower part of the generator is the only part which is not completely incasod by water, but the draft of the fire is away from this part of the generator. It will be observed, also, that the fire from the down and updraft grates may impinge directly against the shell 5 at the rear of the generator. It will be observed, also, that the central drum 15 is at all sides enveloped by the fire. It will be further observed, as before stated, that the radial water-tubes 16, just above the fuel-charging chamber, will be heated directly from the fire below the same, and will serve to keep comparatively cool the fireproof partition above the fire. It will be further noted that the generator is so constructed as to maintain an active circulation of water through all the parts and tubes thereof.

Having fully described my invention, what I desire to claim and secure by Letters latent of the United States is 1. A steam generator consisting of a curved hollow shell, set inclined, with its axis substantially horizontal, and a furnace arranged in the inclined space beneath said hollow shell.

2. A steam generator consisting of a curved hollow shell, with its axis substantially horizontal, hollow ends or heads communicating with said hollow shell, a central drum within said hollow shell and connecting with said hollow ends, and having its axis also substantially horizontal, leaving a fire space between said hollow shelland drum and said hollow ends, and radial water tubes extending from said central drum to said hollow shell.

3. Asteam generator consisting of a curved hollow shell, with its axis substantially horizontal, a central drum within and communicating with said hollow shell, leaving a fire space between said hollow shell and drum, and a mud drum below and connected with said central drum.

4. The combination to form a steam genera-= tor, of a curved hollow shell, with its axis substantially horizontal, a central drum con nected therewith, leaving a fire space between said hollow shell and drum, and a downdraft grate below said hollow shell and adjacent to said drum.

5. The combination to form a steam generator, of a curved hollow shell, with its axis substantially horizontal, a central drum connected therewith,leaving a fire space between said hollow shell and drum, water legs extending from said central drum, a mud drum below communicating with said water legs, and a downdraft grate beneath said hollow shell and adjacent to the said central drum.

6. The combination to form a steam generator, of a curved hollow shell, with its axis substantially horizontal, a central drum. connected therewith, leaving a tire space between said hollow shell and drum, and a downdraft grate beneath said hollow shell, said downdraft grate consisting of water tubes commm nicating at one end with said central drum and connected at the other end with the water of the generator..

7. The combination to form a steam generator, of a curved hollow shell, with its axis substantially horizontal, hollow ends or heads communicating with said hollow shell, a central drum within saidhollow shell and opening into said hollow ends, radial water tubes ex tending between said drum and hollow shell, and a downdraft grate arranged beneath said hollow shell, and consisting of water tubes communicating at one end with said central drum and at the other end with the water of the generator.

8. The combination to form a steam generator, of a curved hollow shell, with 'its axis substantially horizontal, a central drum c0nnected therewith, leaving a fire space between said hollow shell and drum, Water legs extending from said central drum, a mud drum below communicating with said water legs, and a downdraft furnace, consisting of down draft water-tube grate bars communicating at one end with said central drum and connected at the other with the water of the boiler, and an updraft grate arranged below the downdraft grate adjacent to said mud drum.

9. The combination to form a steam genera tor, of a curved hollow shell, with its axis substantially horizontal, a central drum within and communicating with said hollow shell, leaving a fire space between said hollow shell and drum, fire tubes at the front of said generator leading through said hollow shell, and a stack at the front of the generator communicating with said fire tubes.

10. The combination to form a steam generator, of a curved hollow shell, with its axis substantially horizontal, a central drum with-- in and communicating with said hollow shell, leaving a fire space between said hollow shell and drum, radial water tubes extending between said drum and shell, a downdraft grate arranged beneath said shell, and a fire-proof covering or arch-ways for the radial tubes next above the downdraft grate, said fireproof covering or arch-ways leaving the lower part of said latter-mentioned radial tubes exposed to the fire on the downdraft grate,

In testimony whereof I have hereunto set my hand and aflixed my seal in the presence of the two subscribing witnesses.

JAMES J. ROHAN. [n s] Witnesses:

A. O. FOWLER, JOHN F. GREEN, 

